<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
  </ul>
  <script>
    //  Array.from(lis) 把伪数组转换为真数组
    const lis = document.querySelectorAll('ul li')
    // console.log(lis)
    // lis.pop() 报错
    const liss = Array.from(lis)
    liss.pop()
    console.log(liss)
  </script>
</body>

</html>